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| Mirrors > Home > MPE Home > Th. List > djuenun | Structured version Visualization version GIF version | ||
| Description: Disjoint union is equinumerous to union for disjoint sets. (Contributed by Mario Carneiro, 29-Apr-2015.) (Revised by Jim Kingdon, 19-Aug-2023.) |
| Ref | Expression |
|---|---|
| djuenun | ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ∪ 𝐷)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | djuen 10255 | . . 3 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ⊔ 𝐷)) | |
| 2 | 1 | 3adant3 1150 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ⊔ 𝐷)) |
| 3 | relen 8986 | . . . 4 ⊢ Rel ≈ | |
| 4 | 3 | brrelex2i 5708 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ∈ V) |
| 5 | 3 | brrelex2i 5708 | . . 3 ⊢ (𝐶 ≈ 𝐷 → 𝐷 ∈ V) |
| 6 | id 23 | . . 3 ⊢ ((𝐵 ∩ 𝐷) = ∅ → (𝐵 ∩ 𝐷) = ∅) | |
| 7 | endjudisj 10254 | . . 3 ⊢ ((𝐵 ∈ V ∧ 𝐷 ∈ V ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐵 ⊔ 𝐷) ≈ (𝐵 ∪ 𝐷)) | |
| 8 | 4, 5, 6, 7 | syl3an 1178 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐵 ⊔ 𝐷) ≈ (𝐵 ∪ 𝐷)) |
| 9 | entr 9041 | . 2 ⊢ (((𝐴 ⊔ 𝐶) ≈ (𝐵 ⊔ 𝐷) ∧ (𝐵 ⊔ 𝐷) ≈ (𝐵 ∪ 𝐷)) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ∪ 𝐷)) | |
| 10 | 2, 8, 9 | syl2anc 596 | 1 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ∪ 𝐷)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 Vcvv 3450 ∩ cin 4088 ∪ cun 4148 ∅c0 4277 class class class wbr 5102 ≈ cen 8978 ⊔ cdju 9986 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-ord 6368 df-on 6369 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-1st 8005 df-2nd 8006 df-1o 8484 df-er 8725 df-en 8982 df-dju 9989 |
| This theorem is used by: dju1en 10257 djucomen 10263 djuassen 10264 xpdjuen 10265 onadju 10279 pwxpndom2 10757 |
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